单项选择题

A．A writer.
B．A lecturer.
C．A scientist.
D．A doctor.
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单项选择题
A．A clerk at the airport information desk.B．A clerk at the railway station information desk.C．A policeman.D．A taxi driver.
A．A clerk at the airport information desk.
B．A clerk at the railway station information desk.
C．A policeman.
D．A taxi driver.
单项选择题
A．To move muscles.B．To early different messages.C．To protect the nerves.D．To control nerve cells.
A．To move muscles.
B．To early different messages.
C．To protect the nerves.
D．To control nerve cells.
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